http://kenta.blogspot.com/2013/06/bgvtnpai-factorization-of-brents-c158.html

The final complete answer is:

? factorint(p252-1)
%19 =
[2 13]

[3 1]

[13 1]

[23 1]

[29 1]

[6329 1]

[760347109 1]

[211898520832851652018708913943317 1]

[9409853205696664168149671432955079744397 1]

[3035625952640765962086368602839492329385321995258480540549 1]

[21014737139156086365509400019795978246705779843330697799891230652189207470396514322958290676782759071 1]